How Cells are Organised 91 GCSE Science Biology OCR AQA Edexcel

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https://goo.gl/C6vQnM to unlock the full GCSE Biology Combined Science videos series for the new 9-1 OCR, AQA and Edexcel specifications. • They key points covered in this video include: • 1. Tissues • 2. Organs • 3. Organ systems • Tissues • Cells are the basic building blocks of all living organisms. Cells are arranged into tissues. The definition you need for the exam is: A tissue is a group of cells with similar structure and function that work together to carry out a particular function. Examples include: Muscular tissue. Glandular tissue which secretes things like enzymes and hormones. Nervous tissue. Epithelial tissue which line the cavities and surfaces of blood vessels and organs. • Organs • The next level of organisation are the organs. An organ is a group of different tissues that work together to perform a specific function. Examples include: the heart, lungs, stomach. • Organ Systems • Organs are organised into organ systems. An organ system is a group of organs that work together to perform a particular function. Examples include: the digestive system and the cardiovascular system. These systems enable the exchange and transport of materials inside large multicellular organisms. • Summary • 1. A tissue is a group of cells with similar structure and function that work together to carry out a particular function. • 2. Organs are aggregations of different tissues that work together to perform a specific function • 3. An organ system is a group of organs that work together to perform a particular function

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